Function AST_PrepareCreateOp

src/ast/ast_build_op_contexts.c:433–461

//------------------------------------------------------------------------------

AST_CreateContext AST_PrepareCreateOp
(
	QueryGraph *qg,
	rax *bound_vars,
	const cypher_astnode_t *clause
) {
	// shouldn't operate on the original bound variables map
	// as this function may insert aliases
	rax *bound_and_introduced_entities = raxClone(bound_vars);

	NodeCreateCtx *nodes_to_create = array_new(NodeCreateCtx, 1);
	EdgeCreateCtx *edges_to_create = array_new(EdgeCreateCtx, 1);

	const cypher_astnode_t *pattern = cypher_ast_create_get_pattern(clause);
	uint npaths = cypher_ast_pattern_npaths(pattern);

	for(uint j = 0; j < npaths; j++) {
		const cypher_astnode_t *path = cypher_ast_pattern_get_path(pattern, j);
		AST_PreparePathCreation(path, qg, bound_and_introduced_entities,
				&nodes_to_create, &edges_to_create);
	}

	raxFree(bound_and_introduced_entities);

	AST_CreateContext ctx = { .nodes_to_create = nodes_to_create,
		.edges_to_create = edges_to_create };

	return ctx;
}